Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / ComponentModel / DefaultValueAttribute.cs / 1305376 / DefaultValueAttribute.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.Runtime.InteropServices; #if !SILVERLIGHT using System.Runtime.Serialization.Formatters; #endif using System.Security.Permissions; ////// #if !SILVERLIGHT [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1019:DefineAccessorsForAttributeArguments")] [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes")] #endif [AttributeUsage(AttributeTargets.All)] public class DefaultValueAttribute : Attribute { ///Specifies the default value for a property. ////// This is the default value. /// private object value; ////// public DefaultValueAttribute(Type type, string value) { // The try/catch here is because attributes should never throw exceptions. We would fail to // load an otherwise normal class. try { #if !SILVERLIGHT this.value = TypeDescriptor.GetConverter(type).ConvertFromInvariantString(value); #else if (type.IsEnum) { this.value = Enum.Parse(type, value, true); } else if (type == typeof(TimeSpan)) { this.value = TimeSpan.Parse(value); } else if (type.Module == typeof(string).Module) { this.value = Convert.ChangeType(value, type, CultureInfo.InvariantCulture); } #endif } catch { #if !SILVERLIGHT Debug.Fail("Default value attribute of type " + type.FullName + " threw converting from the string '" + value + "'."); #else Debug.WriteLine("Default value attribute of type " + type.FullName + " threw converting from the string '" + value + "'."); #endif } } ///Initializes a new instance of the ///class, converting the /// specified value to the /// specified type, and using the U.S. English culture as the /// translation /// context. /// public DefaultValueAttribute(char value) { this.value = value; } ///Initializes a new instance of the ///class using a Unicode /// character. /// public DefaultValueAttribute(byte value) { this.value = value; } ///Initializes a new instance of the ///class using an 8-bit unsigned /// integer. /// public DefaultValueAttribute(short value) { this.value = value; } ///Initializes a new instance of the ///class using a 16-bit signed /// integer. /// public DefaultValueAttribute(int value) { this.value = value; } ///Initializes a new instance of the ///class using a 32-bit signed /// integer. /// public DefaultValueAttribute(long value) { this.value = value; } ///Initializes a new instance of the ///class using a 64-bit signed /// integer. /// public DefaultValueAttribute(float value) { this.value = value; } ///Initializes a new instance of the ///class using a /// single-precision floating point /// number. /// public DefaultValueAttribute(double value) { this.value = value; } ///Initializes a new instance of the ///class using a /// double-precision floating point /// number. /// public DefaultValueAttribute(bool value) { this.value = value; } ///Initializes a new instance of the ///class using a /// value. /// public DefaultValueAttribute(string value) { this.value = value; } ///Initializes a new instance of the ///class using a . /// public DefaultValueAttribute(object value) { this.value = value; } ///Initializes a new instance of the ////// class. /// public virtual object Value { get { return value; } } public override bool Equals(object obj) { if (obj == this) { return true; } DefaultValueAttribute other = obj as DefaultValueAttribute; if (other != null) { if (Value != null) { return Value.Equals(other.Value); } else { return (other.Value == null); } } return false; } public override int GetHashCode() { return base.GetHashCode(); } protected void SetValue(object value) { this.value = value; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007./// Gets the default value of the property this /// attribute is /// bound to. /// ///
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